ACK: [PATCH 0/1][SRU][oem-5.13/oem-5.14/impish/jammy] platform/x86: amd-pmc: Fix s2idle failures on certain AMD laptops

[Tim Gardner]

Acked-by: Tim Gardner <tim.gardner at canonical.com>

On 12/13/21 7:29 AM, You-Sheng Yang wrote:
> BugLink: https://bugs.launchpad.net/bugs/1954633
> 
> [Impact]
> 
> AMD Ryzen 7 platforms fail to s2idle when powered by bettery.
> 
> [Fix]
> 
> Upstream fix commit 49201b90af81 ("platform/x86: amd-pmc: Fix s2idle
> failures on certain AMD laptops") from v5.16-rc5.
> 
> [Test Case]
> 
> Run checkbox suspend/resume tests on battey:
> 
>    $ checkbox-cli run \
>        com.canonical.certification::stress-suspend-30-cycles-with-reboots-automated
> 
> [Where problems could occur]
> 
> This shortens AMD PMC communication poll delay to a half of the original
> value. While we don't have much information about the exact value range
> allowed, the side effect couldn't be evaluated practically. This change
> was ACKed by AMD developers and has been marked cc stable, we'll
> probably bump into it anyway.
> 
> [Other Info]
> 
> This may affect kernel >= 5.11. While Hirsute is near its EOL, it was
> skipped here.
> 
> Fabrizio Bertocci (1):
>    platform/x86: amd-pmc: Fix s2idle failures on certain AMD laptops
> 
>   drivers/platform/x86/amd-pmc.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 

-- 
-----------
Tim Gardner
Canonical, Inc